If you upgrade to Spring Boot 2.4 and see test compilation errors for JUnit classes such as org.junit.Test, this may be because JUnit 5’s vintage engine has been removed from spring-boot-starter-test.

Spring Boot now uses Tomcat 8 and Jetty 9 as embedded servlet containers. This provides Servlet 3.1 and enhanced WebSocket support out of the box. You can still use ...

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